linux-kernel - Re: [PATCH v2 6/7] usb: bdc: Halt controller on suspend

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Message-ID: <b1a22324-65d2-24b8-6ff4-4c502ed8a4b7@gmail.com>
Date:   Tue, 21 Jul 2020 10:34:18 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Al Cooper <alcooperx@...il.com>, linux-kernel@...r.kernel.org
Cc:     Danesh Petigara <danesh.petigara@...adcom.com>,
        devicetree@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Sasi Kumar <sasi.kumar@...adcom.com>
Subject: Re: [PATCH v2 6/7] usb: bdc: Halt controller on suspend

On 7/21/20 7:43 AM, Al Cooper wrote:
> From: Danesh Petigara <danesh.petigara@...adcom.com>
> 
> GISB bus error kernel panics have been observed during S2 transition
> tests on the 7271t platform. The errors are a result of the BDC
> interrupt handler trying to access BDC register space after the
> system's suspend callbacks have completed.
> 
> Adding a suspend hook to the BDC driver that halts the controller before
> S2 entry thus preventing unwanted access to the BDC register space during
> this transition.
> 
> Signed-off-by: Danesh Petigara <danesh.petigara@...adcom.com>
> Signed-off-by: Al Cooper <alcooperx@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian